/*
* Conditions Of Use 
* 
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain.  As a result, a formal
* license is not needed to use the software.
* 
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
* 
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*  
* .
* 
*/
/*******************************************************************************
* Product of NIST/ITL Advanced Networking Technologies Division (ANTD).        *
*******************************************************************************/
package gov.nist.javax.sip.header;

/**
 * A generic extension header for the stack. 
 * The input text of the header gets recorded here.
 *
 * @version 1.2 $Revision: 1.4 $ $Date: 2006/07/13 09:01:26 $
 * @since 1.1
 *
 * @author M. Ranganathan   <br/>
 *
 * 
 */
public class ExtensionHeaderImpl
	extends SIPHeader
	implements javax.sip.header.ExtensionHeader {

	/**
	 * Comment for <code>serialVersionUID</code>
	 */
	private static final long serialVersionUID = -8693922839612081849L;
	
	protected String value;

	/**
	 * This was added to allow for automatic cloning of headers.
	 */
	public ExtensionHeaderImpl() {
	}

	public ExtensionHeaderImpl(String headerName) {
		super(headerName);
	}

	/**
	 * Set the name of the header.
	 * @param headerName is the name of the header to set.
	 */

	public void setName(String headerName) {
		this.headerName = headerName;
	}

	/**
	 * Set the value of the header.
	 */
	public void setValue(String value) {
		this.value = value;
	}

	/**
	 * Get the value of the extension header.
	 * @return the value of the extension header.
	 */
	public String getHeaderValue() {
		if (this.value != null) {
			return this.value;
		} else {
			String encodedHdr = null;
			try {
				// Bug fix submitted by Lamine Brahimi
				encodedHdr = this.encode();
			} catch (Exception ex) {
				return null;
			}
			StringBuffer buffer = new StringBuffer(encodedHdr);
			while (buffer.length() > 0 && buffer.charAt(0) != ':') {
				buffer.deleteCharAt(0);
			}
			buffer.deleteCharAt(0);
			this.value = buffer.toString().trim();
			return this.value;
		}
	}

	/**
	 * Return the canonical encoding of this header.
	 */
	public String encode() {
		return new StringBuffer(this.headerName)
			.append(COLON)
			.append(SP)
			.append(this.value)
			.append(NEWLINE)
			.toString();
	}

	/**
	 * Return just the body of this header encoded (leaving out the
	 * name and the CRLF at the end).
	 */
	public String encodeBody() {
		return this.getHeaderValue();
	}
}
